Call system.



'il l. MURPHY E. MLLEH.

CALL SYSXEM.

2 SHEETS-SHEET l.

T. J. MURPHY L E. MILLER.

CALL SYSTEM.

APPLICATION FILED JULY 17. 1916.

PatentedJun 25, 19W.

2 SHEETS-SHEET 2.

ruse.

qui.

THOMAS .T.MURPHY AND EDWARD MILLER, OF ROCHESTER, NEW YORK.

CALL SYSTEM.

Specification of Letters Itatent.

. Patented June 26, 191W.

Application led July 17, 1916. Serial No. 109,689. v v

To all whom t may concern.' l

'Be it known that we, THOMAS J. MURPHY,

a subject of the King of Great Britain, and

EDWARD Mninnn, a citizen of the United States, residents of'Rochester,in the'county of Monroe and State of New York, have'invented a certainnew and useful Call System; and wedo hereby declare thefollowing to bea'full, clear, and exact description of` it has forv its object toprovidea simple call.

system which will indicate upon calling 'Whether the party called is inposition to receive the call.

By our invention signaling devices are located at the calling and at'the called station and are each controlled by a'switch l0- catedpreferably at the station called, other than the one at which thecalling. device is located. The invention is dependent upon the rise inresistance of the tungsten lament, due to increased temperature, ithaving a low initial resistance when cold.

Referring to the figures wherein are shown a system involving ourinvention and devices that may be used in connection there'- with,Figure 1 illustrates a front view or cover plate for push button andlamp. Fig.

2 illustrates a shell or housing which mayA be secured in a recessformed in a wall. Fig. 3 is a sectional View taken on the line 3 3indicated in Fig. 2. Figt is a diagram ci the connections of the partsof the system. Fig. 5 is a plate used in a modificationv ott the systemshown in Fig. 1. Fig. 6r

is a view of a shell vor housing. Fig. 7 is a sectional view taken onthe line 7--7 indicated in Fig.l 6. Fig. 8 is a section of a part of astructure illustrated in Figs. 1, 5 and 7 and is a View taken on theline Sf-S indicated in Fig. 5. Fig. 9 is a diagram showing connectionsbetween the parts of the modified system.

` 1, Fig. 1, is a front or covering plate :which covers a shell orhousing 2, which vmay be located in a recess of a wall. The

cover platelis secured to the wall by means of screws 3 and therebylocks the housing 2 in a recess that may be cut into the wall.

The plate 1 is provided'with an opalescent glass 5, which may be securedin the plate 1 1n anyv suitable way. The plate 1 is also provided with a,short sleeve 6 in which a push button 7 may be inserted. The pushbutton 7 may be provided with afiange 8 vvwhich is pressed against theinner end of the cylinder 6 by means of one of the spring contacts thatis operated by the push button in the manner well known in the art. The

housing 2 is provided with an inturned lip 10 at each end of the housingwhich iits the bevel 11 of the ends ofthe plate 1 on the under side ofthe plate 1 so that when the plate 1 is placed against the housing 2 theplate 1 operates to hold the housing in somewhat deiinite relation tothe'plate 1.

The housing 2 is also provided with lateral extending iianges 12 toWhich may be secured, if desired,.rings 13, as shown in Fig. 8, whichare located on the plate 1. The ground glass lenses "5 maybe secured inthe rings 13 and the rings 13 may be secured to the housing 2 by meansof screws 14. which also operate to clamp the plate 1 in a` definiteposition relative to the housing 2.

The housing 2 is also provided with a lamp 2O having a tungsten filament21. The lamp is secured in a suitable socket 22 and is iusulatinglysupported in the interior of the housing 2, suitable means beingprovided for connecting the lamp 20 with an Aexternal circuit such as bythe pin 23. The lamp 20 is located in proximity to the opalescent lens 5and so as to illuminate the same when the lamp is lighted.

The push button 7 operates upon the I 'spring contacts 25 so asl toclose the said contacts. The contacts are supported and connected to anexternal circuit by means Y of lthe pins 23 and 28. 'If desired, thehous- .ing mav be provided with insulating sheets drawing, the battery35 is connected on one side to one of the contacts 25 and on the otherside to a vibrator 36 of the Well known i type, which makes and breaksthe circuit in which it is connected in its operation. It is alsoconnected to a resistance 37 located in a shunt circuit which is closedand opened by means'of the switch 38. The vibrator and switch 38 areconnected to the lamp `2O and the lamp 20 is connected to the remainingcontact 25. a

In operation the system is in calling conl dition whether the switch 38'is open or closed. When the button 7 is pressed to l dition, as whenthe party at the called station leaves the station, the switch 38 isclosed so as to close the shunt having the resistance 37, and if thenthe push button 7 is pressed the shunt circuit will allow a continuouscurrent to pass through the filal ment of the lamp 20 and will becomelighted. This will put the system in feeble ringing condition,indicating at station called the condition of the system. I

In the form of the system illustrated in Fig. 9, having the partsillustrated in Figs.

5, 6 and 7, 'the covering plate 40 is provided with two opalescentglasses, one of which is' shown at 41, the figure showing the other oneas being removed for purposes of illustration. The opalescent glassesare located at the ends of the plate 40 and the push b'utton 42 islocated centrally with respect to the plate 40 and between the lenses41. A housing 43 is provided with two lamps 44 and 45, which are securedin sockets 46 and 47; They are suitably secured in the housing 43.- Thepush button 42 operates to close the spring contacts 49. Means areprovided for connecting the lamps and the contacts with an externalcircuit in any suitable manner. As shown in the diagram Vof Fig. 9, thebattery 51 is connected to one of the contacts 49 on one side and to avibrator 55 on the other side. arm 56 is connected to the vibrator. Theswitch arm 56 is made soas to bridge either pair of contacts 57 or 58when the switch 56 is thrown in one direction or the other.- The switchcontact 56 bridges lower contact 57 and lower contact 58 simultaneously,to prevent having the bell on open circuit. Thelower contacts areconnected to a resistance 59 which will then be connected in shunt withthe vibrator 55. The lower one of the contacts 57 is connected to thelamp A switch connectedto the lamp 45, and the lamps 44 and 45 areconnected to the remaining contact 49. In the operation the switch 56 isplaced either on one pair 57 or on the other pair 58, of contacts, andwhen the push button 42 is pressedv so as to close the circuit throughthe contacts 49 the current will pass either through the lamp 44 or thelamp 45 and the pair of contacts 57 or 58, according to the position ofthe switch 56. This will cause the current to divide at this point, partof which will pass through the vibrator 55 and a part through theresistance 59'to the battery 51. This will cause one or the other of thelamps 44 or 45 to become li ht'ed and also causethe vbell 55 to ringfeehly. The lamps 44 and 45, depending on which one is lighted, willindicate to the operator whether or not the called party has receivedthe call, for if he is in the switch 56 having contact will be placed soas to complete the circuit to the contacts 57, which will cause the lamp44 to be lighted, and when he goes out, or at will, he will throw theswitch 56 so as to complete the circuit to the contacts 58, which willcause the, lamp 45 Vto become lighted whenthe push button 42 is pressed.

The` invention may be modified by those skilled in the art withoutdeparting from the spirit thereof.

I-Iaving thus described our invention, what we claim as new and desireto secure by Iletters Patent, is,-

1. In a call system, the combinationof a. source of current supply, acircuit closer and a lamp located at a calling station, a vibratorsignaling device located in series with the lamp and the circuit closer,a resistance connected in shunt with the vibrating signaling device anda switch for opening and closing the circuit through the resistance, thevibrating signaling device, the resistance and the switch located at astation to be called to cause the lamp to become lighted when thecircuit closer and the switch are closed and to cause the operation ofthe vi` brating signaling device and to prevent the lighting of the lampwhen the 'circuit closer is closed and the switch is open.

2. In a call system, the combination of a source of current supply, acircuit closer, a lamp having a tungsten filament land a vibratorsignaling device located in series, a resistance connected in shunt tothe vibrator lsignaling device, a switch for opening and closing thecircuit through the resistance to cause the lamp to become lighted andto prevent the operation of the vibrator signaling device when thecircuit closer and the switch are closed, and to cause the operation ofthe vibrating signaling device and to prevent the` lighting of the lampwhen the circuit closer is closed and the switch is open.

1,231,537 y' i l 3. ln a call system, the combination of a source ofcurrent supply, a vibrator signalling device and a circuit closer, apair of.

'signed our names to this specication,

lamps having tungsten laments'located .in a parallel circuits, aresistance located in a circuit in shunt t0 the vibrator signalindevice, a switch for connecting either amp `with the resistance and 'thevibrator signaln device., l

n testimony whereof, We' have hereunto 1li Titoli/LAS J. MURPHYc EPWRDMULER

